Spain introduced Christianity n the New World to gain favour with the Pope. Pope is considered to the head of the Catholic Church. Spanish spread Christianity because of the Dudum siquidem, issued in 1493 by Pope Alexander VI. The Papal Bull (Inter caetera) approved unclaimed lands to be found and turn the Natives into Christianity. The Pope ordered Christianity to spread in America because he believed in religious supremacy. Spain agreed to follow the request of the Pope to get recognition.
The Jews didn't try to leave because 1.) they had family and friends there and 2.) the Germans put them in ghettos, which were places to keep the Jews in. Basically, it was a prison.
Offspring that benefited by inheriting several mutations out-competed the offspring lacking the mutations.So, the population changed and they grew the mutations to protect themselves
The Legislative branch makes the laws. The laws are written, discussed and voted on in Congress. There are 100 senators in the Senate, two from each state.